麻烦解释下一些英语短语,问句的意思!

问题描述:

麻烦解释下一些英语短语,问句的意思!
1)you are a lucky dog.2)I am dog tired.3)every dog has its day .4)our team was the underdog but won the first place at last.

1)你是一个幸运儿
2)dog-tired
adj.
疲倦极的,筋疲力尽的
所以,整句是我累惨了的意思
3)1.凡人皆有得意日
2.十年风水轮流转
4)我们队是处于劣势的,但是最后却得了第一名